题目内容：
如图，在平面直角坐标系中，▱OABC的顶点A，B在第一象限内，顶点C在y轴上，经过点A的反比例函数y＝k/x（
x＞0）的图象交BC于点D．若CD＝2BD，▱OABC的面积为15，则k的值为______．
参考答案：
答案解析：
选择题：如图，在平面直角坐标系中，▱OABC的顶点A，B在第一象限内，顶点C在y轴上，经过点A的反比例函数y＝k/x（x＞0）的图象交BC于点D．若CD＝2BD，▱OA
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